Target: We need to join many mp3 files to one large file.

=> There are two ways to do it.

1- Just use command fromt

Fist of all, you copy all files needed to join to a directory, for instance, C:\join

Start > run, type: cmd

Go to the just created directory by the command: cd C:\join

To join all files in that directory, type: copy /b *.mp3 C:\onelarge.mp3

Just some of selected songs in the directory: copy /b file1.mp3+file2.mp3 c:\onelarge.mp3

2- Use software.

There is a good and free software to do this task: MakeitOne. It can join many audio files very quickly.

Download: http://www.makeitone.net/downloads/index.htm